Anytime someone makes a statement along those lines, I would take it to mean that 1-A, or Class One as they call it these days, is not as strong, or "weak" if you choose to use that word, just because the schools are smaller than the ones in the other classes. So in other words, HR 6 and others mean that it is weak by comparison, not weaker than it used to be itself.
Same thing as the college ranks...You would expect an Alabama or an Ohio State to have a stronger football team than a Bridgewater or Hampden-Sydney. So in this case,I think they just mean that Class 6 should be stronger than Class 5, and so on down the line.